op 	 {
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    type: DT_INT32
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    type: DT_INT32
  }
  input_arg {
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    type_attr: "T"
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  output_arg {
    name: "bins"
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  attr {
    name: "T"
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    allowed_values {
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        type: DT_INT32
        type: DT_INT64
        type: DT_FLOAT
        type: DT_DOUBLE
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}
